Selective single trigger



Patented Jan. 9, 1945 U NITED STATES liiiTENTA O FFICE SELECTIVEL. SINGLE TRIGGER Halvorlsen Eiane, Washington Island, Wis.

Application. August 19, 1943, Serial No..499,2.7.7

7- Claims.

My invention relates to improvements in selective single trigger mechanism. for double` bar- -'rel guns; andthe objects ot my improvements are; first, to provide a selective single. trigger mechanism' capable of functioning without any co-opera'tive action. from.k the lock-mechanism of a gun; second, to so construct the. trigger mechanism that ring of both barrels at the same time will beimpossibe; and. third, to facilitate conversion of existing double barrel guns with double triggers to single trigger guns, with little or no discarding of oldv parts except old double triggers.

I attain these objects by the use of a novel trigger mechanism hereinafter more. fully described and claimed, having reference' tothe accompanying drawing in which: Fig. 1 represents a side view of the whole trigger mechanism as mounted in a trigger plate, partly sectional. Fig. 2 is a side view of a trigger blade in detached relation. Fig. 3 is a rear View of the trigger blade shown in Fig.. 2. Fig. 4 represents a. rear view of a two-armedy spring shitting. lever in detached relation. Fig. 5y is a right side'view of the lever shown in Fig; 4. Fig. 6` is a bottom View of a trigger body in detached relation and showing a hinge-pin in position. Fig. '7 is a top view of the trigger body shown in Fig. 6, andv shows a pair of bridges. across its milled out portion and a longitudinally disposed hinge-pin supported in the bridges. Fig. 8 rep.- resents a rear View of the trigger body in detached relation and carrying a hinged longitudinally disposed trigger blade in ready position for firing of a right gun barrel, while dotted lines indicate position of trigger blade, for firing a left gun barrel. Fig.-9 is a. rear view-0f a hingeblock for movably connecting the front portion of the trigger body to a trigger plate in hinged relation. Fig. 10 is a side View of the hingeblockshown in Fig. 9. Fig. 11 represents a side view of a pivotal selective lever provided with an integral formed stem. Fig. 12 is a side view of the selective lever shown in Fig. 11. Fig. 13 represents a .bottom View of a pivotal action spring in detached relation, for imparting sidewise movements to the trigger'lblade. Fig. 14 is a side view of the action spring shown in Fig. 13. Fig. 15 is a rear view of .one of a pairY of bridges, for use across the main. portion ofthe trigger body. Fig. 16 is an enlarged cross sectional detail view of a slot located. at the lowerA end of. the spring shifting lever shown in Fig; 4. Similar numerals refer to similarv parts throughoutA the several views. i

A, in Figs. 1, 6, 7 and 8, is a trigger body pro- Across the upper portions of the sidef the. bridges are uslr with the upper portions of theside walls 3, and in thisA position. thebridges 4l are then permanently weldedor brazedA to the side-walls 3. y

InA the center of the bridges; 4 is-a passage, 6, (shown in Fig. 15) through which a hinge-pin 'I is tightly insertedy (see. Fig. 7)..

A trigger blade 8 is provided with: a longitudinal passage il in its lower portion. (shown in position, and thus limit they movements of the blade to. the. exact predetermined positions.,

It will be noted in Fig. 3, that the trigger blade 8. is provided with a pair of cam-lugs Irl-#R and II-L at its lower` rearwardcorner, whose func.- tional purpose will presently be explained. y

At the upper rear corner. of the trigger blade 8 isv a. round rearwardly Apointing pivot. stud' l2, which-is integral with the blade 8. and which fits a pivot hole or passagel3- in the upper. end of a two-armed spring shifting. lever I4, (see Eig.'

4). while a semi-circularl collar I5y on the. lever I4 is. turned into a recess IIS,A cut in the blade. 8 and thus, the collar I5` retains the lever I4 in position by occupying the recess I6. A pair of arms I'l-Rand II-L extend from both sides of the lever I4- at its upper portion, while at the lower end of the lever I4 is a vertically disposed slot i8, as shown in Fig. 4. y

Referring to Figs. 6 and 7, it will be noted that a bearing hole I9 is providedA in the bottom part or iloor of the trigger body A, for pivotal mounting of a stem 20, which is an integral part of' a selective lever 2l. An action. spring 22, provided withv a terminal eye or sleeve23 at its front end and a contact point 24 adjacent its rear end is placed partly under thev bridges 4, so that the terminal sleeve 23 will be in alignment with the bearing hole I9, after which the st em can be put through the bearing hole I9 and the sleeve 23; and during this stage. of assembling, the selective lever 2l is at rightA angle with the trigger body A, so that by a quarter turn, a tongue 25 on the lever 2| can occupy a segmental groove 25 in the trigger body A. It will be particularly noted that in Fig. 11, the stem 20 is provided with a short squared section 2l,A which fits tightly into a squared aperture 28 in the upper portion of'i'the terminal sleeve 23; and with a nut 29 (shown-in Fig. 1) to engage a threaded section 30 on the stem20, the spring 22 is thus firmly secured to the stem 20 and the selective lever 2l. At the rear end of the spring 22 is a short section 3l, which is rounded for reception by the slot I8 in the lower end of the spring shifting lever I4, but it will be borne in mind that the spring 22 is pivotally mounted and its movements describe part of a circle for which allowance in the slot I8 must be made in the form of funnel-shaped sides as shown in Fig. 16, in order to reduce the amount of play to a minimum,

The trigger body A is mounted in hinged relation to a trigger plate 32 through a hinge-block 33, which is provided with a threaded stud 34 thatY Vand a crosswise passageY 38 in the hinge-block 33 (shown in Figs. 1 and 10) are drilled for reception of a hinge-pin 3'I, (see lig4 6) which thus constitute the hinge arrangement for the trigger body A. The side walls 3 extend in bifurcated form beyond the hinge-pin passage 35, and are provided with downward pointed projections 38 which keep a pair of spiral springs 3S in place, (only one spring being shown in Fig. l) while pockets 48 (of which there also are two) in the trigger plate 32, keep the lower ends of the spiral springs 39 in place, and thus mainttain the trigger body A under spring pressure in a depressed normal position. Y

Referring to Fig, l, it will be seen that a spring 4I is located behind the trigger blade B and secured by a screw 42 to the trigger plate 32, while at its forward and upper end is a centrally located interceptor point 43, which plays a dual functional part in the operation of the trigger mechanism. A

When it is desired to re, we say, Ithe right barrel of a shot gun, the first thing done is to move the selective lever 2| toward the right which brings the Contact point 24 on the spring 22 into Contact with the cam II-L on the trigger blade 8, and as ,the spring 22 exerts upward .pressure, the blade 8 is then tilted over on its hinge to the right side and stopped by the lugs III--R bearing against the bridges 4, and at this stage, the whole trigger mechanism is to all intent and purpose the same as a right side trigger of a gun with double triggers, but as `a finger is pressed against the grip 2 and the trigger blade 8 is raised and contact made with a right side sear, a simultaneous contact is made by the arm II--L on the spring shifting lever I4 against the interceptor point 43, and at the same time the right gun barrel is red, the spring shifting lever I4 swings the rear end of the spring 22 over to..

the right side so the contact point 24 will press against the cam II-R, but the trigger blade 8 is restrained by the interposing interceptor point 43 from tilting over to the left side until the trigger body A is in normal depressed position, when the trigger blade 8 can swing' clear under the interceptor point 43.

It will thus be seen that the interceptor point 43 is the means of actuating the spring shifting lever I4 While the trigger mechanism is on its upward move and at the same time keeps the trigger blade 3 from swinging over to the opposite side before the return movement oi the trigger mechanism is at normal depressed position. This arrangement is an insurance against involuntarily ring the second barrel.

The spring 4I is strong enough to actuate the spring shifting lever I4 without being raised, but is designed to raise a little and cushion the trigger mechanism at the end of its upward movement. As heretofore pointed out, this trigger mechanism does not depend on any co-operative action from any other source, but derives all its functional operating power from its own springs and the squeeze of a gunners trigger nger, and will re each barrel alternately as long as de- 'sired.

Although the sears are no part of the present invention, I have shown portions of associate sears designated as 44-L and 44-R, merely to illustrate their relative positions with the trigger blade 8, as shown in Figs. 1 and 8.

The use of the letters L and R, indicate left and right respectively.

I do not intend to limit my invention lto the exactr descriptions and drawings as herein given, as many changes can be made without departing from the principles involved.

Havingr thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a selective single trigger mechanism for double barrel guns, the construction therein comprising a hinged trigger body having bottom floor and vertically disposed side walls terminating in parallel bifurcated extensions, a transverse passage through said bifurcated extensions, a trigger plate having a slot-shaped aperture for operatively accommodating said trigger body, a hinge-block xed to said trigger plate between said bifuroated extensions, a hinge-pin through said transverse passage and said hinge-block, a projecting point on the bottom side of eachof said extensions and corresponding pockets in said trigger plate, a pair of spiral springs mounted in said pockets and retained under tension by said projecting points, a pair of bridges .in iixed relation across said side walls, a trigger blade hingedyto said bridges and movable in transverse relation to said trigger body, a curved trigger grip onv said trigger body, means for effecting a selective position of said trigger blade, and means for effecting an alternate opposite position of said trigger blade in connection with each pull of said trigger.

2. In a selective single trigger mechanism for double barrel guns, the construction therein comprising a trigger body having bottom floor and vertically disposed side walls along said iloor, a trigger plate having a slot-shaped aperture for accommodating said trigger body in hinged relation, a curved trigger grip underneath said bottom floor, a segmental groove in the front end of said grip, a vertically disposed passage through said voor. a selective lever provided with a pivotal stem and a segmentalprojecting tongue pivotally mounted in said passage and having an yinterloclred relation with said segmental groove, a pair oi" bridges across said side walls in permanent xed positions, a longitudinal passage through said bridges relative to a center line in said trigger body, a trigger blade also provided with a longitudinal passage through its bottom portion, a hinge-pin through said longitudinal passages connecting said trigger blade to said bridges in hinged relation, a two-armed lever pivotally mounted on said trigger blade and movable in transverse relation to said blade, a double faced cam-lug on said trigger blade, an action spring fixed to said pivotal stem and in operative con nection with said two-armed lever and in engageable contact with said double faced camlug, and associate means for co-ordinating upward movement of said trigger body and blade with simultaneous interceptive action on said two-armed lever in electing a reversed. position of said action spring.

3. In a selective single trigger mechanism for double barrel guns, a trigger body having vertically disposed side walls and bottom floor, a trigger plate for hinged mounting of said trigger body, a selective pivot stem journalled through said iioor, a trigger blade mounted in hinged relation to said trigger body, an action spring provided with a terminal sleeve iiXed upon said pivot stem by means comprising a square formed section on said pivot stem, a complementarily square formed aperture in said sleeve, and a threaded section formed on said stem for receiving a threaded nut, an integrally formed double faced cam-lug extending from the right and left Side of said trigger blade, a Contact point adjacent to the rear end of said action spring engaging said double faced cam-lug, a two-armed lever having a slot formed at its lower end portion pivotally mounted on the upper rear portion of said trigger blade and movable in transverse relation to said blade, an operative connection between said slot and the rear end portion of said action spring, and means for co-ordinating upward movement of said trigger body with simultaneous interceptive action upon said two-armed lever effecting a reversed position of said action spring, said means comprising an interceptor spring secured to said trigger plate in a centerline position and provided with an elevated interceptor point arranged for intercepting one arm of said twoarmed lever in alternate opposite shifting order.

4. In a selective single-trigger mechanism for double barrel guns, a trigger body having vertical side walls and bottom floor, a trigger plate for receiving said trigger body in movably hinged relation, a pivot stemA journalled through said floor, a pair of bridges Xed in crosswise relation to said side walls, a trigger blade having a double faced cam-lug movably hinged to said bridges, a two-armed lever pivotally mounted on said trigger blade, a slot formed at the lower end of said two-armed lever, an action spring iiXed to said pivot stem and engaging said cam-lug and operatively connected to said slot, a pair of stop-lugs at each side of said trigger blade arranged to bear against said bridges and maintain said blade in a right or left inclined position, an interceptor spring provided with an elevated projecting interceptor point centrally xed to said trigger plate, and a pair of associated Sear members arranged to be engaged by said trigger blade in alternate opposite order.

5. In a selective single trigger mechanism for double barrel guns, a trigger body having vertically disposed side walls and bottom iioor, a trigger plate for receiving said trigger body in movably hinged relation, a selective pivot stem journalled in said bottom floor, a pair of bridges in permanent xed position across said side walls, a

front end of said interceptor spring and in central overhead position relative to the hinged position of said trigger blade, a pair of associate sear members, said triggerbody and blade arranged for hinged movement from a normal low position to an elevated high position to effect contact and release of one of said sear members and simultaneously elect a reversed position of said action spring throughmeans of said twoarmed lever in interceptive action against said interceptor point and to interpose restraint against side movement of said trigger blade by means of said interceptor point prior to resumption of normal position of said trigger body.

6. In a selective single trigger mechanism for double barrel guns, the construction therein comprising a trigger body having vertically disposed side walls and bottom fioor, a trigger plate for receiving said trigger body in movably hinged relation, a coiled spring arrangement for maintaining said trigger body urider spring pressure in normal depressed position, a selective pivot stem journalled through said bottom floor, a pair of bridges fixed in permanent position across said side walls, a trigger blade connected in hinged relation to saidbridges and movable in transverse relation to said trigger body, a two-armed lever A pivotally mounted on said trigger blade through means comprisingan integral formed pivot stem on said trigger blade and a recessed collar seat adjacent to said integral pivot stem and a complementarily formed sleeve on said two-armed lever embracing said integral -formed stem and a semi-circular collar on said sleeve occupying said collar` seat, a pair of stop-lugs at each side of said trigger blade arranged to bear against said bridges and maintain said blade in either a right or a left inclined position with respect to said trigger body, a double faced cam-lug on said trigger blade, an action spring iixed to said selective pivot stem and engageable with said cam-lug and in operative engagement with said two-armed lever, and a centrally Xed interceptor interposed in the path of said two-armed lever arranged to transform upward 'movement of said trigger body into transverse movement of said two-armed lever to effect reversal of position of said action spring and restrain sidewise movement of said trigger blade until return of said trigger body to a normal depressed position.

7. In a selective single trigger mechanism for double barrel guns, the combination of a selective pivotal lever with an independent acting trigger mechanism comprising a trigger plate, a trigger body hinged to said plate, a pair of bridges on said trigger body, a trigger blade hinged to said trigger body, a two-armed lever pivotally connected to said trigger blade, a double faced cam-lug on said trigger blade, an action spring iixed to said selective lever and in engagement with said double faced cam-lug and in operative connection with said two-armed lever, an interceptor on said trigger plate, and a pair of associate sear members, allconstruoted and arranged for effecting a selective position of said trigger blade and for effecting a regular reversed position of said trigger blade in alternate order through interceptive actions derived from each upward movement of said trigger body and to eiiect contact and to eiect release of one of said sear members in alternate order from self contained derivative actions of said trigger mechanism.

HALvcR oLsEN EIANE. 

